Environmental Science-Nano
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2018
·Vol. 5
·期 5
·1191-1199
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IF 6.087
Yinqing Zhang,Liwen Qiang,Yuting Yuan,Wei Wu,Binbin Sun,Lingyan Zhu
Titanium dioxide nanoparticles (nano-TiO2) and silver nanoparticles (AgNPs) are widely used in industrial products and consumer goods due to their excellent physicochemical and antimicrobial properties. As a result of their wide applications, AgNPs and nano-TiO2 may be present in the same natural aquatic systems or wastewater treatment plants. In this study, the impacts of nano-TiO2 on the transformation of AgNPs in the dark and under simulated sunlight irradiation were investigated. Under dark conditions, heteroaggregation occurred between nano-TiO2 and AgNPs. Under sunlight irradiation, nano-TiO2 promoted the dissolution of AgNPs to release Ag+ ions and the impact became more significant as the concentration of nano-TiO2 increased. The promotion effect was attributed to the highly oxidative hydroxyl radicals generated by nano-TiO2 under sunlight irradiation. Meanwhile, some small fresh Ag0 nanoparticles formed due to the reduction of the released Ag+ ions by the photogenerated electrons on nano-TiO2. Natural organic matter, such as fulvic acid, could attenuate the promotion effect due to adsorption on the surface of nano-TiO2 and suppression of generation of hydroxyl radicals. Since Ag+ ions and small sized Ag0 nanoparticles displayed greater toxicities than large-sized AgNPs, the interaction of nano-TiO2 and AgNPs under sunlight irradiation could significantly affect the bioavailability and ecotoxicities of AgNPs.
研究领域:
环境科学
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纳米毒理学
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水污染治理
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DOI
高影响因子
Environmental Science-Nano
·
2018
·Vol. 5
·期 10
·2452-2460
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IF 6.087
Yinqing Zhang,Junchao Xia,Jinliang Xu,Binbin Sun,Wei Wu,Lingyan Zhu
Due to their excellent properties, silver nanowires (AgNWs) have been applied increasingly in many optical and electronic products, and may be inevitably discharged in aquatic environments. Dissolution and sulfidation are two of the most important processes of AgNWs occurring in aquatic environments and may significantly affect their fate and toxicities. This study aimed to investigate the impacts of four types of surfactants on the dissolution and sulfidation of AgNWs. Anionic, zwitterionic, and nonionic surfactants, including sodium dodecylbenzenesulfonate, cetyl betaine, and glycerol monostearate, did not affect the dissolution and sulfidation of AgNWs. However, cationic surfactants (cetyltrimethylammonium bromide, cetyltrimethylammonium nitrate and benzyldimethyldodecylammonium nitrate) promoted the dissolution and sulfidation of AgNWs significantly. The cationic surfactants, especially cetyltrimethylammonium bromide, preferred to bind with the (111) planes of AgNWs, leading to the corrosion of the initial wire structure of AgNWs to shorter nanorods. The increased surface area of AgNWs resulted in faster dissolution. The dissolved Ag+ ions reacted with sulfide quickly, leading to faster sulfidation of AgNWs. In addition, the cationic surfactants interacted with AgNWs and decreased the electrostatic repulsion between the sulfide ions and the surface of AgNWs, thus promoting the direct oxysulfidation. As a consequence, the cationic surfactants facilitated the sulfidation of AgNWs to a greater extent than dissolution. The interaction of AgNWs and surfactants could significantly affect their bioavailability and ecotoxicities in aquatic environments.
研究领域:
环境科学
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纳米材料科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Bo Gong,Wei Chen,Patrick H.-L. Sit,Xian-Wei Liu,Chen Qian
Dissolved organic matter (DOM) is ubiquitous in aqueous environments and is composed of different components that play different but important roles in the migration and the fate of pollutants , emergence of the disinfect byproduct, thus requiring quantitative characterization. However, until now, simultaneous quantification of the main contents in DOM, i.e., saccharides, proteins, and humic substances , has been difficult, impeding us from understanding and predicting the environmental behaviors of typical pollutants. In this work, a fluorescence approach based on the excitation emission matrix (EEM), combined with a new algorithm, denoted matrix reconstruction coupled with prior linear decomposition (MR-PLD), was developed to quantify multiple DOM simultaneously. First, a set of simulated water samples consisting of glucose, tryptones, and humic acid (HA) were analyzed using MR-PLD to validate the feasibility of the method. The DOM components could be reliably determined with a higher accuracy than parallel factor analysis (PARAFAC) and Parallel Factor Framework-Linear Regression (PFFLR), also with a more convenient procedure than conventional PLD. Second, both actual simulated and experimental methods were performed to test the anti-interference performance of MR-PLD, indicating that the quantification of DOM would not be significantly impacted by other fluorophores. Finally, several actual water samples from natural waters and wastewater treatment plants were also analyzed to confirm the robustness of this method in actual aqueous environments. This study provides a new approach to characterize DOM with EEM, contributing to its convenient concentration monitoring and the further exploration of the environmental impacts.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Qiang Liu,Xiaojun Niu,Dongqing Zhang,Xingyao Ye,Peibing Tan,Ting Shu,Zhang Lin
Phosphite, an essential component in the biogeochemical phosphorus cycle, may make significant contributions to the bioavailable phosphorus pool as well as water eutrophication. However, to date, the potential impacts of coexisting photochemically active substances on the environmental fate and transformation of phosphite in aquatic environments have been sparsely elucidated. In the present study, the effect of zinc oxide nanoparticles (ZnO NPs), a widely distributed photocatalyst in aquatic environments, on phosphite phototransformation under simulated solar irradiation was systematically investigated. The physicochemical characteristics of the pristine and reacted ZnO NPs were thoroughly characterized. The results showed that the presence of ZnO NPs induced the indirect phototransformation of phosphite to phosphate, and the reaction rate increased with increasing ZnO NPs concentration. Through experiments with quenching and trapping free radicals, it was proved that photogenerated reactive oxygen species (ROS), such as hydroxyl radical (•OH), superoxide anion (O 2 •− ), and singlet oxygen ( 1 O 2 ), made substantial contributions to phosphite phototransformation. In addition, the influencing factors such as initial phosphite concentration, pH, water matrixes (Cl − , F − , Br − , SO 4 2− , NO 3 − , NO 2 − , HCO 3 − , humic acid (HA) and citric acid (CA)) were investigated. The component of generated precipitates after the phosphite phototransformation induced by ZnO NPs was still dominated by ZnO NPs, while the presence of amorphous Zn 3 (PO 4 ) 2 was identified. This work explored ZnO NPs-mediated phosphite phototransformation processes, indicating that nanophotocatalysts released into aquatic environments such as ZnO NPs may function as photosensitizers to play a beneficial role in the transformation of phosphite to phosphate, thereby potentially mitigating the toxicity of phosphite to aquatic organisms while exacerbating eutrophication. The findings of this study provide a novel insight into the comprehensive assessment of the environmental fate, potential ecological risk, and biogeochemical behaviors of phosphite in natural aquatic environments under the condition of combined pollution.
研究领域:
环境科学
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生态学
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水生生物学
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产品关联
DOI
PubMed
高影响因子
MARINE POLLUTION BULLETIN
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2021
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IF 5.553
Huixin Du,Hongzhu Ma,Baoshan Xing
Here, naturally weathering plastics were collected and identified to understand the effect of the weathering conditions on their properties. The adsorption and desorption of crystal Violet (CV), a candidate of cationic organic pollutant , on microplastics (MPs) under various environmental conditions were simultaneously explored. The first type was the aged polyethylene (PE-MPs), which exhibited a fibrous structure with a smoother and uniform surface attached some flaps, while the second type was recognized as the aged polypropylene (PP-MPs), which showed a lamellar structure with less smooth and distorted texture surface attached with fragments and small grains. The experiment data fitted well with the pseudo-second-order kinetic and Freundlich isotherm models. The possible interactions between CV and MPs included electrostatic attraction, hydrogen bonding and hydrophobic interactions. This study demonstrates that the high possibility of transport ionic pollutants from fresh water to ocean by the naturally weathering microplastics, highlighting their potential risk in various environments.
研究领域:
环境科学
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生态学
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DOI
高影响因子
Journal of Nanomaterials
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2015
·Vol. 2015
·期 1
·851928
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IF 1.644
Guang’an He,Rui Chen,Shushen Lu,Chengchun Jiang,Hong Liu,Chuan Wang
Various factors affect the sedimentation behavior of nanotitanium dioxide (n-TiO 2 ) in water. Accordingly, this study aimed to select the dominating factor. An index of sedimentation efficiency related to n-TiO 2 concentration was applied to precisely describe the n-TiO 2 sedimentation behavior. Ionic strength (IS), natural organic matter (NOM) content, and pH were evaluated in sedimentation experiments. An orthogonal experimental design was used to sequence the affecting ability of these factors. Furthermore, simulative sedimentation experiments were performed. The n-TiO 2 sedimentation behavior was only affected by pH and NOM content at low levels of IS. Moreover, divalent cations can efficiently influence the n-TiO 2 sedimentation behavior compared with monovalent cations at fixed IS. Seven different environmental water samples were also used to investigate the n-TiO 2 sedimentation behavior in aquatic environments. Results confirmed that IS, in which divalent cations may play an important role, was the dominating factor influencing the n-TiO 2 sedimentation behavior in aquatic environments.
研究领域:
环境科学
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纳米材料
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胶体化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xu Feng,Xiangyu Gu,Guohui Xuan,Hao Wu,Songgeng Li
Microplastics (MPs), as an emerging pollutant, are widely distributed in water environments and pose considerable environmental and health threats due to their chemical inertness and the toxicity of attached substances. The development of high-efficient and facile adsorbents for MPs removal is of significance. Hence, this study proposed an innovative iron–nitrogen co-doped layered adsorbent derived from glucose via molten salt-assisted pyrolysis. The presence of molten salt promoted the formation of layered structures, providing micron-scale channels for the entrapment of MPs from water. Loading iron alone enhanced electrostatic adsorption between MPs and carbon materials; however, excessive dosage clogged the channel structure. This can be solved by co-doping nitrogen, which facilitated uniform iron dispersion. The co-doped layered adsorbent with iron loading at 1.43 % achieved a removal efficiency of 96.5 % and capacity of 148.39 mg·g −1 for polystyrene (PS) MPs amid low plastic concentration and adsorbent dosage. It also exhibited efficient removal for a wide pH range and high salinity solution, maintaining over 90 % efficiency after multiple cycles. Kinetic analysis revealed a combined physical and chemical adsorption mechanism. The molten salt-assisted synthesis combined with iron–nitrogen co-doping offers a promising, scalable solution for MPs pollution control, paving the way for the development of highly efficient and reusable adsorbents with enhanced performance in environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Zhaoyan Yang,Kai Zhu,Kuo Yang,Yeming Qing,Youjiang Zhao,Lei Wu,Shenfei Zong,Yiping Cui,Zhuyuan Wang
Nanoplastics present a significant hazard to both the environment and human health. However, the development of rapid and sensitive analysis techniques for nanoplastics is limited by their small size, lack of specificity, and low concentrations. In this study, a surface-enhanced Raman scattering (SERS) chessboard substrate was introduced as a multi-channel platform for the pre-concentration and detection of nanoplastics, achieved by polydomain aggregating silver nanoparticles (PASN) on a hydrophilic and a punched hydrophobic PVDF combined filter membrane. Through a straightforward suction filtration process, nanoplastics were captured by the PASN gap in a single step for subsequent SERS detection, while excess moisture was promptly eliminated from the filter membrane. The PASN-based SERS chessboard substrate, benefiting from the enhanced electromagnetic (EM) field, effectively discriminated polystyrene (PS) nanoplastics ranging in size from 30 nm to 1000 nm. Furthermore, this substrate demonstrated favorable repeatability (RSD of 8.6 %), high sensitivity with a detection limit of 0.001 mg/mL for 100 nm of PS nanoplastics, and broad linear detection ranges spanning from 0.001 to 0.5 mg/mL (R 2 = 0.9916). Additionally, the SERS chessboard substrate enabled quantitative analysis of nanoplastics spiked in tap and lake water samples. Notably, the entire pre-concentration and detection procedure required only 3 μL of sample and could be completed within 1 min. With the accessibility of portable detection instruments and the ability to prepare substrates on demand, the PASN-based SERS chessboard substrate is anticipated to facilitate the establishment of a comprehensive global nanoplastics map.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 40
·60244-60258
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IF 5.19
Li Jianmin,Han Jiahua,Lan Tingting,Mu Shiyin,Hu Deyu,Zhang Kankan
The hydrolysis and photolysis of the chiral fungicide mandipropamid were investigated, and the potential enantioselectivity of mandipropamid in solutions was further assessed. The aqueous solutions were filtered and directly injected into the liquid chromatography with tandem mass spectrometry. In the hydrolysis experiments, mandipropamid enantiomers hydrolyzed slowly in aquatic solutions with half-lives > 200 days; nevertheless, rise of the pH and incubation temperature could increase the hydrolysis rates more than 1.1 times (half-lives decreased from 495.1 to 216.6 days). Compared with the hydrolysis results, photolysis was found to be the main degradation pathway for mandipropamid in different solutions (half-lives < 14 h, except in pH = 5.05 buffer solution). Organic solvents were able to accelerate the photolysis of mandipropamid, but acidic solutions and the addition of flavonoids or inorganic salts significantly inhibited the photolysis of mandipropamid. During the hydrolysis and photolysis processes, the configuration of mandipropamid enantiomers was stable and five possible transformation products were identified by high resolution mass spectrometry. Due to the enantiomeric fraction values > 0.5, the hydrolysis and photolysis of mandipropamid were enantioselective, and S -( +)-mandipropamid preferentially disspated in certain aqueous solutions. The systematic evaluation of the hydrolysis and photolysis of mandipropamid enantiomers may provide more accurate data for better assessment of environmental and ecological risks in aquatic ecosystems. Graphical abstract
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Xu-Dan Yang,Bo Gong,Wei Chen,Chen Qian,Meng Du,Han-Qing Yu
Microplastics act as a source of organic contaminants in aquatic environments and thus affect their environmental fate and toxicity. Because of the weak and reversible interactions between microplastics and organic species, the organic coronas vary with their surrounding environments. Thus, in order to evaluate the possible environmental risks of microplastics, methods for evaluating the dynamic uptake of organic contaminants onto suspended microplastics in aquatic environments are greatly desired. In this work, a UV–vis spectroscopy-based approach was developed for in-situ monitoring organic contaminants uptake onto suspended microplastics after correcting the light scattering interference from microplastics suspensions and establishing the nonlinear relationship between concentration and light absorbance of organic species. The inverse adding-doubling method based on radiative transfer theory was adopted to correct the light scattering effect of suspensions. Then, the resulting mixed absorption spectra were decomposed to calculate the concentrations of the aqueous and adsorbed organic species simultaneously with a nonlinear calibration method. The uptake processes of bisphenol A and p-nitrophenol onto nylon 66 microparticles were monitored with this approach and confirmed by high-performance liquid chromatography analysis. The approach was validated by applying it to natural water samples, and the equilibrium adsorption capacity was found to be interfered mainly by the protein-like substances. This approach has high accuracy, good reproducibility, remarkable universality, and ease of handling, and also provides a potential tool for characterizing the corona formation process on suspended particles both in natural and artificial environments, such as eco-corona formation and engineering surface modification on nano/micro-particles.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiayan Wu,Quanyun Ye,Meiqing Chen,Leiye Sun,Sheng Liu,Linqing Liu,Pingxiao Wu,Nengwu Zhu
The heteroaggregation of nanoplastics with minerals has been widely investigated. However, few studies have focused on the interaction between similar negatively charged clay minerals and nanoplastics, especially how their interactions affect the migration of heavy metals. This study investigated heteroaggregation of kaolinite (a model of natural mineral) with polystyrene nanoplastics (PSNPs) and the effect of heteroaggregates on lead (Pb 2+ ) sorption . Dynamic light scattering (DLS) measurement highlighted that PSNPs owned higher colloidal stability than kaolinite in aquatic environments. Due to the surface charge heterogeneity of kaolinite, the heteroaggregation behavior between kaolinite and PSNPs was highly pH-dependent. At pH 3.0 and 6.0, kaolinite particles with positively charged edge surfaces favored the association of PSNPs. PSNPs were found to be primarily attached on the kaolinite edge (010) surface, followed by Al-terminated (001) and Si-terminated (00 1 ¯ ) surfaces based on density functional theory (DFT) calculations. At pH 10.0, they had negligible interaction due to the strong electrostatic repulsion. Interestingly, kaolinite carried more negative charges after heteroaggregation with PSNPs, resulting in slower edge-to-face homoaggregation and higher dispersibility, and thus increasing the sorption capacity for Pb 2+ . This investigation provided a new understanding of nanoplastics interactions with negatively charged minerals and highlighted the vital role of nanoplastics in mineral stability and contaminant migration.
研究领域:
环境科学
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土壤化学
·
污染生态学
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Kai Han,Yanjun Liu,Jianan Hu,Junjie Jia,Shujuan Sun
With the development of medical drugs, the widely used tetracycline has brought many adverse effects on the ecosystem and human health. Tetracycline pollution of water environment is becoming more and more serious, and has become an emerging environmental problem. As single celled organisms, microalgae are not only model organisms for risk assessment of aquatic ecosystems , but also can efficiently purify sewage. Microalgae-mediated pollutant remediation has attracted more and more attention from researchers. In this paper, Chlamydomonas reinhardtii ( C. reinhardtii ) was used to remove tetracycline in aqueous solution, and the removal efficiency and mechanism of microalgae on tetracycline were studied. The results showed that the removal rates of tetracycline by active and inactivated microalgae at a density of 5 × 10 6 cells·mL −1 were 81.9% and 89.8%, respectively. C. reinhardtii removed tetracycline through biosorption and nonmetabolic processes. Microalgal cell supernatant and hydroxyl radicals could significantly promote the removal of tetracycline. The positively charged tetracycline was electrostatically adsorbed on the microalgae surface and extracellular polymeric substances. Microalgae biomass can promote the production of ROS and enhance the ability of microalgae to remove tetracycline.
研究领域:
环境科学
·
水生生态学
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生物修复
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DOI
高影响因子
危险品化学品经营许可证（带存储）